Search results for "Empetrum"
showing 3 items of 3 documents
Melno visteņu (Empetrum nigrum) ogu un lapu ķīmiskais sastāvs
2017
Melnā vistene (Empetrum nigrum) ir plaši izplatīts augs Ziemeļu puslodē, un tā ir sastopama arī Latvijas mežos un purvos. Bakalaura darba mērķis ir veikt melno visteņu ogu, to izspiedņu un lapu ķīmiskā sastāva kompleksu izpēti dažādos ekstraktos, un identificēt ogu sastāvā esošos lipīdu klases un antociānu grupas savienojumus, veicinot melno visteņu svaigu ogu un to izspiedņu izmantošanu jaunu produktu izstrādē. Daudziem melnās vistenes sastāvā atrastajiem ķīmiskajiem savienojumiem piemīt antioksidatīva, antimikrobiāla un pretiekaisuma iedarbība. Bakalaura darbā ir pētīti un identificēti melno visteņu ogu izspiednēs un lapās esošie savienojumi. Pētījumā tika secināts, ka kompleksā melno vis…
Individual and combined effects of disturbance and N addition on understorey vegetation in a subarctic mountain birch forest
2011
Questions: What are the effects of repeated disturbance and N-fertilization on plant community structure in a mountain birch forest? What is the role of enhanced nutrient availability in recovery of understorey vegetation after repeated disturbance? How are responses of soil micro-organisms to disturbance and N-fertilization reflected in nutrient allocation patterns and recovery of understorey vegetation after disturbance? Location: Subarctic mountain birch forest, Finland. Methods: We conducted a fully factorial experiment with annual treatments of disturbance (two levels) and N-fertilization (four levels) during 1998‐2002. We monitored treatment effects on above-ground plant biomass, plan…
Compositional and morphological analyses of wax in northern wild berry species.
2019
Accepted manuscript version, licensed CC BY-NC-ND 4.0. Aerial surfaces of plants are covered by a waxy cuticle protecting plants from excessive water loss and UV light. In the present study, composition and morphology of cuticular waxes of northern wild berry species bilberry (Vaccinium myrtillus L.), lingonberry (V. vitis-idaea L.), bog bilberry (V. uliginosum L.) and crowberry (Empetrum nigrum L.) were investigated. Scanning electron microscopy (SEM) revealed differences in epicuticular wax morphology, and gas chromatography–mass spectrometry (GC–MS) analysis confirmed variation in chemical composition of cuticular waxes between the berry species. The dominant compounds in bilberry and li…